Test Coverage Improver

Use this skill when you need a prioritized, risk-aware plan to improve tests from coverage results.

Usage assumptions

• Focus scope is either changed lines/files, a module, or the whole repository.
• Coverage artifact must be generated or provided in a supported format.
• If required context is missing, call out assumptions explicitly before proposing work.

Workflow

1. Define scope and baseline

   • Confirm target language, framework, and branch.
   • Confirm whether the scope is changed files only or full-repo.

2. Produce coverage snapshot

   • Rust: cargo llvm-cov (or cargo tarpaulin) with existing repo config.
   • JavaScript/TypeScript: npm test -- --coverage and read coverage/coverage-final.json.
   • Python: pytest --cov=<pkg> --cov-report=json and read coverage.json.
   • Collect total, per-file, and changed-line coverage.